html - The meaning of "header td" -

html - The meaning of "header td" -

i'm not familiar these kind of functions, explain me "header td" , if it's necessary in css? have header doesn't work properly. tried delete part css, whole header gone.

css code of header:

/* header --------------------------------------------------------------------------------*/ #header-wrap { background:url(headerluminescentlarge.png)no-repeat center; background-size: contain; box-shadow:inset 0 0px 0px rgba(0,0,0,0.3); } .wsite-custom-background #header-wrap { background: none; } #header { border-collapse: collapse; border-spacing: 0; width:100%; height:100%; } #header td { vertical-align: middle; text-align: left; height: 500px; }

#header td selects <td> elements within element having id header.

you've specified height:100%; header, parent (#header-wrap) doesn't seem have height set explicitly, hence height in % won't applied.

once removed style rule

#header td { vertical-align: middle; text-align: left; height: 500px; }

the kid elements don't have height set, why header disappeared (its height 0).

html css html-table semantics